There is no single prototype QB to draw comparisons from - Cam Newton ain't Matt Ryan ain't Tom Brady ain't Russell Wilson ain't Dak Prescott.
There are, for sake of argument, 15+ different physical or mental attributes that go into making a quality QB, and no one QB scores a "10" in every category (& in fact, compensates for weaknesses in some categories with strengths in others).
The danger in singling out a Prescott or Newton is that you'll develop a short list of "almost as good as..." prospects who resemble the build and style of a successful QB but don't quite measure up in most if not all attributes.
Best we look at each QB prospect in terms of his unique assets and liabilities (at most developing a set of ideal attributes and seeing how well each prospect meets them).